The cost of a food safety plan will vary from food processor to food processor. In general, the price will depend on your facility, production process, and the industry that you're in (e.g. dairy). You will need to hire a consultant to assess your business and the present risks before getting clear idea of what a plan will cost to develop*.
Using FoodByte may significantly reduce the labor cost of plan development, as it can reduce the time to develop a food safety plan by up to 90%.
* If you have an employee that is qualified to develop a food safety program that meets SFCR regulations, you won't need to hire a consultant.